CN203020178U - Rear-end collision prevention device based on single chip microcomputer - Google Patents

Abstract

The utility model discloses an anti-rear collision device based on a single-chip microcomputer, which comprises a laser ranging sensor module, a vehicle speed sensor, a single-chip microcomputer, a liquid crystal display unit, a buzzer and a brake control unit, a laser ranging sensor module, and the input of the vehicle speed sensor and the single-chip microcomputer The liquid crystal display unit, the buzzer and the brake control unit are connected with the output terminal of the single-chip microcomputer. The utility model adopts a 16-bit single-chip microcomputer, which has fast processing speed, low price, and convenient manufacture. It adopts laser distance measurement, which has high accuracy, improves the distance measurement accuracy and processing speed, can be installed on any vehicle, and has good versatility.

Description

A kind of SCM Based rear-end device

Technical field

The utility model belongs to the automobile active safety technical field, is specifically related to a kind of SCM Based rear-end device.

Background technology

Along with China's expanding economy, the raising of living standards of the people, automobile pollution constantly rises, and traffic safety has become by the problem of social extensive concern, and automobile active safety is driven and day by day is taken seriously.In all kinds of fatal accidents in the world, toll on traffic accounts for 60%, and motor traffic accidents has become problem very important in the public safety problem.To the analysis showed that of a large amount of traffic accidents, the vehicle over 65% bumps against and belongs to the collision of knocking into the back, and all the other belong to, and bump against the side and positive collision.Relevant studies show that has accident hazard and takes appropriate measures if chaufeur can be recognized in advance, and 90% rear-end collision and 60% head-on crash accident can be avoided.Therefore, design the chaufeur that to help of a kind of lower cost, superior performance and survey front the spy apart from instrument of automobile of the place ahead obstacle, for domestic low and middle-end car, very high marketable value will be arranged.Visit apart from instrument before automobile and adopt radar ranging, completed by the transmitter-receiver device that is installed on the headstock bumper/spoiler, signal is flowed to micro controller system, then calculate the distance between headstock and obstacle, by telltale range of a signal and the caution of sounding, make chaufeur be unlikely to clobber in the process of driving a car thereby take in case of necessity automatically to control brake again.This device has the many merits such as cheap, easy for installation, easy to use.

Summary of the invention

For the deficiency that prior art exists, the purpose of this utility model is, a kind of SCM Based rear-end device is provided, and this device can make vehicle and obstacle remain safety distance, until vehicle stop travels.

In order to realize above-mentioned task, the utility model adopts following technical scheme to be achieved:

A kind of SCM Based rear-end device, comprise the laser range sensor module, car speed sensor, micro controller system, liquid crystal display, buzzer phone and brake control unit, the laser range sensor module is connected with the input end of micro controller system with car speed sensor, and liquid crystal display, buzzer phone and brake control unit are connected with the mouth of micro controller system.

The utility model also has following technical characterstic:

Described laser range sensor module comprises laser emission element, laser pick-off unit, Echo Processing unit, time-interval-unit and information process unit.

Described micro controller system adopts the MC9S12XS128 micro controller system.

What the utility model adopted is 16 micro controller systems, and processing speed is fast, and low price is easy to make, adopts laser ranging, and accuracy is high, improves range finding accuracy and processing speed, can be arranged on any vehicle, and commonality is good.

Description of drawings

Fig. 1 is annexation schematic diagram of the present utility model.

Fig. 2 is the principle of work schematic diagram of laser range sensor module.

Below in conjunction with drawings and Examples, particular content of the present utility model is described in more detail.

The specific embodiment

Below provide specific embodiment of the utility model, need to prove that the utility model is not limited to following specific embodiment, all equivalents of doing on present techniques scheme basis all fall into protection domain of the present utility model.

Defer to technique scheme, as shown in Figure 1, a kind of SCM Based rear-end device, comprise the laser range sensor module, car speed sensor, micro controller system, liquid crystal display, buzzer phone and brake control unit, the laser range sensor module is connected with the input end of micro controller system with car speed sensor, and liquid crystal display, buzzer phone and brake control unit are connected with the mouth of micro controller system, and fast installation of sensors is on the gear after automobile gearbox.

Described laser range sensor module comprises laser emission element, laser pick-off unit, Echo Processing unit, time-interval-unit, information process unit.The laser range sensor module is arranged on the Automobile front bumper, and in laser emission element, semiconductor laser adopts MQW (Mult one Quantum Well) the InGaAs semiconductor laser PGEW2S09 that Canadian Excelitas company (illumination of former PerkinElmer and detection solution division department) produces.The AD500-9 that the laser pick-off unit adopts German SILICON SENSOR company to produce, this is the avalanche diode of a silicon epitaxy diffused, it has, and noise is low, fast response time, multiplication factor is moderate and low cost and other advantages.

As shown in Figure 2, laser emission element is carved the Emission Lasers pulse at a time, start trigger signal START, time opening interval measurement; Light pulse is launched to target from emitting antenna, is reflected after distance L arrives target; The photodetector of receiving cable receives and returns to pulse, and amplification and the shaping unit of arriving signal after amplifying produce one and stop STOP signal, termination time interval measurement; Time-interval-unit outputs to signal processing unit to measured time gap in the mountain as a result, obtains at last distance L reality.

Described micro controller system adopts the MC9S12XS128 micro controller system, the MC9S12XS128 micro controller system is 16 micro controller systems of Freescale company exploitation, abundant instruction repertoire is provided, have stronger numerical operation and logical operation capability, the inside Flash program store of 128KB, the RAM memory device of 12KB, the EEPROM of 4KB, integrated serial communication interface, serial device interfaces on this micro controller system, the functional modules such as USB interface, A/D converter, PWM and CAN.Can process in real time the signal of laser sensor letter and tachogenerator, the computationally secure distance, and send control signal according to actual distance to control unit.

Described liquid crystal display adopts the 5110(PCD8544 of Nokia controller) Liquid Crystal Display, 48*84 dot matrix LCD, it can receive in real time information that the breath processing unit carries and show with the form of word.

Described brake control unit adopts the electric control hydraulic braking system, is arranged in the automobile brake loop, and micro controller system is to the electric control hydraulic braking system signal, and then brake system is controlled automobile from main brake by mechanical device.

Power supply unit of the present utility model is being reduced to 3.3V supply liquid crystal display (when ignition lock open begin power supply) by LM1117-3.3 with 5V by pressing integrated circuit LM7805 that storage battery is reduced to 5V for micro controller system through the ignition lock power supply voltage.

Workflow of the present utility model is as follows: after automobile ignition switch starts, micro controller system begins to power on, program initialization, the laser emission element of laser range sensor module begins Emission Lasers, and run up time, interval measurement unit, can reflect after laser is encountered obstacle, if the laser pick-off unit does not receive echo in setting time, illustrate that obstacle is distant from the distance of vehicle, need not calculate actual distance, only need to show do not have obstacle just on liquid crystal display; Give micro controller system signal if the laser pick-off unit receives echo at the appointed time and process, by the actual distance of micro controller system dyscalculia thing and vehicle; Micro controller system reads the vehicle speed signal that car speed sensor transmits, calculate the safety distance of vehicle this moment, and by liquid crystal display, safety distance and current vehicle speed are shown, the size of micro controller system judgement safety distance and actual distance simultaneously, if actual distance less than safety distance the Single-chip Controlling buzzer phone carry out the warning tones prompting; If actual distance less than safety distance 80% carry out the warning tones prompting and the time control vehicle brake by brake control unit, make car retardation in the safety distance scope, warning tones prompting also can according to actual distance and safety distance the gap ratio change frequency.

Claims (3)

1. A rear-end collision prevention device based on single-chip microcomputer, it is characterized in that, comprises laser ranging sensor module, vehicle speed sensor, single-chip microcomputer, liquid crystal display unit, buzzer and braking control unit, laser ranging sensor module and vehicle speed sensor and single-chip The input terminals are connected, and the liquid crystal display unit, the buzzer and the brake control unit are connected with the output terminals of the single-chip microcomputer. the 2. The anti-rear-collision device based on single-chip microcomputer as claimed in claim 1, characterized in that, said laser ranging sensor module comprises a laser emitting unit, a laser receiving unit, an echo processing unit, a time interval measuring unit and an information processing unit . the 3. The anti-rear-end collision device based on single-chip microcomputer as claimed in claim 1, wherein said single-chip microcomputer adopts MC9S12XS128 single-chip microcomputer. the

Images